Paper Title:
Effect of Cerium and Silicon Additions to MCrAIY on the High-Temperature Oxidation Behavior and Bond Strength of Thermal Barrier Coatings
  Abstract

It is well known, that thermally grown oxide (TGO) forms at the interface between the thermal barrier top coating (TBC) and the bond coating during service. In previous work, SEM images showed that the TGO layer contained at least two layers with different oxides. One layer was Al2O3, and the other was a mixed oxide of NiO, CoO, Cr2O3, and their spinels. It was supposed that a reason for macro-crack formation near an interface is due to a decrease in bond strength or to the formation of stress concentration sites caused by the formation of pores in the mixed oxide. In order to improve the bond strength, a modified bond coating material was developed, which is MCrAlY with Ce and Si added. Four- point bending tests were carried out to measure the bond strength of conventional TBC and of the modified TBC with MCrAlYCeSi bond coating. As a result, the TBC with modified bond coating had a bond strength superior to the conventional one. It is likely that the reason for the superior bond strength is due to a notable difference in oxidation behavior.

  Info
Periodical
Key Engineering Materials (Volumes 261-263)
Edited by
Kikuo Kishimoto, Masanori Kikuchi, Tetsuo Shoji and Masumi Saka
Pages
1061-1066
DOI
10.4028/www.scientific.net/KEM.261-263.1061
Citation
M. Tanno, K. Ogawa, T. Shoji, "Effect of Cerium and Silicon Additions to MCrAIY on the High-Temperature Oxidation Behavior and Bond Strength of Thermal Barrier Coatings", Key Engineering Materials, Vols. 261-263, pp. 1061-1066, 2004
Online since
April 2004
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$32.00
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